public static bool CutTriangleMesh(Mesh[] outputMeshes, Mesh sourceMesh, Plane cuttingPlane, Transform transform, Transform rotation, bool cap)
{
float epsilon = 0.00001f;
debugPolyLoop = new List <Vector3>();
debugEdgePoints = new List <Vector3>();
debugEdges = new List <Vector3[]>();
debugLoopEdgePoints = new List <Vector3[]>();
int vertCount = sourceMesh.vertexCount;
Vector3[] verts = sourceMesh.vertices;
Triangle3D.Vertex[] allVerts = new Triangle3D.Vertex[vertCount];
for (int i = 0; i < vertCount; i++)
{
allVerts[i] = new Triangle3D.Vertex(transform.TransformPoint(verts[i]));
}
List <Triangle3D.Vertex> allVertList = new List <Triangle3D.Vertex>();
Vector2[] originalUVs = sourceMesh.uv;
Vector3[] originalNormals = sourceMesh.normals;
Vector4[] originalTangents = sourceMesh.tangents;
int triCount = sourceMesh.triangles.Length / 3;
Triangle3D[] originalTriangles = new Triangle3D[triCount];
int offset = 0;
for (int j = 0; j < sourceMesh.subMeshCount; j++)
{
uint triOffset = 0;
int[] subMeshIndices = sourceMesh.GetTriangles(j);
int subMeshTriCount = subMeshIndices.Length / 3;
for (int i = 0; i < subMeshTriCount; i++)
{
int idx0 = subMeshIndices[triOffset + 0];
int idx1 = subMeshIndices[triOffset + 1];
int idx2 = subMeshIndices[triOffset + 2];
originalTriangles[offset++] = new Triangle3D(allVertList, new Triangle3D.Vertex[] { allVerts[idx0], allVerts[idx1], allVerts[idx2] }, new Vector3[] { originalNormals[idx0], originalNormals[idx1], originalNormals[idx2] }, new Vector2[] { originalUVs[idx0], originalUVs[idx1], originalUVs[idx2] }, new Vector4[] { originalTangents[idx0], originalTangents[idx1], originalTangents[idx2] }, new int[] { subMeshIndices[triOffset + 0], subMeshIndices[triOffset + 1], subMeshIndices[triOffset + 2] }, j);
triOffset += 3;
}
}
if (originalTriangles.Length > 0)
{
int processedTriCount = 0;
Triangle3D[] processedTris = new Triangle3D[originalTriangles.Length * 3];
ClassificationUtil.Classification prevSide = ClassificationUtil.Classification.UNDEFINED;
foreach (Triangle3D originalTriangle in originalTriangles)
{
ClassificationUtil.Classification side;
Triangle3D[] splitTriangles = TriangleUtil.SplitTriangleWithPlane(originalTriangle, cuttingPlane, epsilon, out side, cap);
if (prevSide != ClassificationUtil.Classification.UNDEFINED && prevSide != side)
{
}
prevSide = side;
if (splitTriangles != null)
{
// Triangle was cut
foreach (Triangle3D splitTriangle in splitTriangles)
{
processedTris[processedTriCount] = splitTriangle;
processedTriCount++;
}
}
else
{
// Triangle was not cut
processedTris[processedTriCount] = originalTriangle;
processedTriCount++;
}
}
int triangleBucketACount = 0;
int triangleBucketBCount = 0;
Triangle3D[] triangleBucketA = new Triangle3D[processedTriCount];
Triangle3D[] triangleBucketB = new Triangle3D[processedTriCount];
for (int i = 0; i < processedTriCount; i++)
{
ClassificationUtil.Classification[] classes;
ClassificationUtil.Classification triClass = ClassificationUtil.ClassifyPoints(processedTris[i].pos, cuttingPlane, out classes, epsilon);
if (triClass == ClassificationUtil.Classification.FRONT)
{
triangleBucketA[triangleBucketACount++] = processedTris[i];
}
else if (triClass == ClassificationUtil.Classification.BACK)
{
triangleBucketB[triangleBucketBCount++] = processedTris[i];
}
}
if (triangleBucketACount == 0 || triangleBucketBCount == 0)
{
return(false);
}
List <Triangle3D> totalCapTriBucket = new List <Triangle3D>();
List <Triangle3D.Vertex> totalCapVertBucket = new List <Triangle3D.Vertex>();
while (cap && debugEdges.Count > 2)
{
List <Triangle3D> capTriBucket = new List <Triangle3D>();
List <Triangle3D.Vertex> capVertBucket = new List <Triangle3D.Vertex>();
Triangle3D.Vertex[] sortedVerts = GetPolyLoop(ref debugEdges);
if (sortedVerts != null)
{
CapMesh(out capTriBucket, out capVertBucket, sortedVerts, transform, rotation, totalCapTriBucket.Count);
}
if (capVertBucket.Count > 2)
{
for (int i = 0; i < capVertBucket.Count - 1; i++)
{
Debug.DrawLine(transform.TransformPoint(capVertBucket[i].pos), transform.TransformPoint(capVertBucket[i + 1].pos));
}
Debug.DrawLine(transform.TransformPoint(capVertBucket[capVertBucket.Count - 1].pos), transform.TransformPoint(capVertBucket[0].pos));
}
totalCapTriBucket.AddRange(capTriBucket);
totalCapVertBucket.AddRange(capVertBucket);
}
if (triangleBucketACount > 0)
{
SortMesh(outputMeshes[0], triangleBucketA, triangleBucketACount, transform, totalCapTriBucket, totalCapVertBucket, false);
}
if (triangleBucketBCount > 0)
{
SortMesh(outputMeshes[1], triangleBucketB, triangleBucketBCount, transform, totalCapTriBucket, totalCapVertBucket, true);
}
return(true);
}
else
{
Debug.Log("source geometry empty");
return(false);
}
}
public static bool CutTriangleMeshFast(Mesh[] outputMeshes, Mesh sourceMesh, Transform objectTransform, Transform planeTransform, bool cap)
{
float epsilon = 0.00001f;
hashCheck = new Dictionary <Vector3, int>();
debugPolyLoop = new List <Vector3>();
debugEdgePoints = new List <Vector3>();
debugEdges = new List <Vector3[]>();
debugLoopEdgePoints = new List <Vector3[]>();
int originalVertexCount = sourceMesh.vertexCount;
Vector3[] originalVertices = sourceMesh.vertices;
int originalIndexCount = sourceMesh.triangles.Length;
int[] originalIndices = sourceMesh.triangles;
Vector3 centre = objectTransform.transform.InverseTransformPoint(planeTransform.position);
Vector3 up = objectTransform.transform.InverseTransformDirection(planeTransform.up);
Plane cuttingPlane = new Plane(up, centre);
int totalIndexCount = originalIndexCount;
int totalVertexCount = originalVertexCount;
int indexBufferCountA = 0;
int vertexBufferCountA = 0;
Vector3[] vertexBufferA = new Vector3[totalVertexCount * 10];
int[] indexBufferA = new int[originalIndexCount * 10];
int indexBufferCountB = 0;
int vertexBufferCountB = 0;
Vector3[] vertexBufferB = new Vector3[totalVertexCount * 10];
int[] indexBufferB = new int[originalIndexCount * 10];
Vector3[] points = new Vector3[3];
int[] triIndices = new int[3];
for (int i = 0; i < totalIndexCount; i += 3)
{
triIndices[0] = originalIndices[i];
triIndices[1] = originalIndices[i + 1];
triIndices[2] = originalIndices[i + 2];
points[0] = originalVertices[triIndices[0]];
points[1] = originalVertices[triIndices[1]];
points[2] = originalVertices[triIndices[2]];
int[] newTris;
Vector3[] newPoints;
ClassificationUtil.Classification side;
TriangleUtil.SplitTriangleWithPlane(
ref totalVertexCount,
points,
triIndices,
cuttingPlane,
epsilon,
out side,
cap,
out newTris,
out newPoints);
// Slice the triangle then classify which side it's on
if (newTris != null)
{
for (int j = 0; j < newTris.Length; j += 3)
{
ClassificationUtil.Classification[] classes;
ClassificationUtil.Classification triClass = ClassificationUtil.ClassifyPoints(
new Vector3[] { newPoints[j + 0], newPoints[j + 1], newPoints[j + 2] },
cuttingPlane,
out classes,
epsilon);
//Debug.DrawLine(newPoints[j + 0], newPoints[j + 1]);
//Debug.DrawLine(newPoints[j + 1], newPoints[j + 2]);
//Debug.DrawLine(newPoints[j + 2], newPoints[j + 0]);
if (triClass == ClassificationUtil.Classification.FRONT)
{
indexBufferA[indexBufferCountA++] = newTris[j + 0];
indexBufferA[indexBufferCountA++] = newTris[j + 1];
indexBufferA[indexBufferCountA++] = newTris[j + 2];
vertexBufferA[vertexBufferCountA++] = newPoints[j + 0];
vertexBufferA[vertexBufferCountA++] = newPoints[j + 1];
vertexBufferA[vertexBufferCountA++] = newPoints[j + 2];
}
else if (triClass == ClassificationUtil.Classification.BACK)
{
indexBufferB[indexBufferCountB++] = newTris[j + 0];
indexBufferB[indexBufferCountB++] = newTris[j + 1];
indexBufferB[indexBufferCountB++] = newTris[j + 2];
vertexBufferB[vertexBufferCountB++] = newPoints[j + 0];
vertexBufferB[vertexBufferCountB++] = newPoints[j + 1];
vertexBufferB[vertexBufferCountB++] = newPoints[j + 2];
}
}
}
else
{
ClassificationUtil.Classification[] classes;
ClassificationUtil.Classification triClass = ClassificationUtil.ClassifyPoints(
new Vector3[] { points[0], points[1], points[2] },
cuttingPlane,
out classes,
epsilon);
//Debug.DrawLine(points[0], points[1], Color.red);
//Debug.DrawLine(points[1], points[2], Color.red);
//Debug.DrawLine(points[2], points[0], Color.red);
if (triClass == ClassificationUtil.Classification.FRONT)
{
indexBufferA[indexBufferCountA++] = triIndices[0];
indexBufferA[indexBufferCountA++] = triIndices[1];
indexBufferA[indexBufferCountA++] = triIndices[2];
vertexBufferA[vertexBufferCountA++] = points[0];
vertexBufferA[vertexBufferCountA++] = points[1];
vertexBufferA[vertexBufferCountA++] = points[2];
}
else if (triClass == ClassificationUtil.Classification.BACK)
{
indexBufferB[indexBufferCountB++] = triIndices[0];
indexBufferB[indexBufferCountB++] = triIndices[1];
indexBufferB[indexBufferCountB++] = triIndices[2];
vertexBufferB[vertexBufferCountB++] = points[0];
vertexBufferB[vertexBufferCountB++] = points[1];
vertexBufferB[vertexBufferCountB++] = points[2];
}
}
}
if (indexBufferCountA > 0)
{
SortMesh(outputMeshes[0], indexBufferA, vertexBufferA, indexBufferCountA, false);
}
if (indexBufferCountB > 0)
{
SortMesh(outputMeshes[1], indexBufferB, vertexBufferB, indexBufferCountB, true);
}
return(true);
}
